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Allowance for Credit Losses - Loans - Commercial and commercial real estate loan portfolios (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans $ 1,039,638   $ 1,039,638   $ 1,038,271
Current period gross charge-offs, Total 204 $ 170 620 $ 339  
Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 139,758   139,758   159,424
Current period gross charge-offs, Total 132 $ 75 424 $ 75  
Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 241,519   241,519   240,286
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 70,493   70,493   128,219
2023/2022 135,084   135,084   120,075
2022/2021 104,518   104,518   126,424
2021/2020 114,894   114,894   70,567
2020/2019 67,162   67,162   66,896
Prior 204,015   204,015   182,673
Revolving Loans Amortized to Basis 56,786   56,786   65,703
Revolving Loans Converted to Term 881   881   269
Total loans 753,833   753,833   760,826
Current period gross charge-offs, 2023/2022         75
Current period gross charge-offs, 2022/2021     424    
Current period gross charge-offs, 2020/2019         804
Current period gross charge-offs, Prior         2,433
Current period gross charge-offs, Total     424   3,312
Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 3,991   3,991   17,801
2023/2022 17,674   17,674   6,750
2022/2021 6,105   6,105   15,531
2021/2020 12,419   12,419   8,415
2020/2019 10,836   10,836   12,574
Prior 28,222   28,222   26,802
Revolving Loans Amortized to Basis 383   383   1,274
Revolving Loans Converted to Term 881   881    
Total loans 80,511   80,511   89,147
Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 10,278   10,278   22,662
2023/2022 20,124   20,124   35,435
2022/2021 23,015   23,015   12,894
2021/2020 9,759   9,759   5,831
2020/2019 4,878   4,878   4,912
Prior 22,473   22,473   21,165
Revolving Loans Amortized to Basis 49,231   49,231   56,455
Revolving Loans Converted to Term         70
Total loans 139,758   139,758   159,424
Current period gross charge-offs, 2023/2022         75
Current period gross charge-offs, 2022/2021     424    
Current period gross charge-offs, Prior         405
Current period gross charge-offs, Total     424   480
Commercial | Commercial real estate (non-owner occupied) - retail          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 12,928   12,928   35,545
2023/2022 39,137   39,137   23,682
2022/2021 21,463   21,463   33,110
2021/2020 32,227   32,227   23,146
2020/2019 22,520   22,520   9,226
Prior 39,423   39,423   36,269
Revolving Loans Amortized to Basis 978   978   983
Total loans 168,676   168,676   161,961
Current period gross charge-offs, Prior         2,028
Current period gross charge-offs, Total         2,028
Commercial | Commercial real estate (non-owner occupied) - multi-family          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 17,567   17,567   22,620
2023/2022 27,106   27,106   16,767
2022/2021 16,515   16,515   16,622
2021/2020 16,951   16,951   13,007
2020/2019 12,546   12,546   10,916
Prior 32,309   32,309   28,755
Revolving Loans Amortized to Basis 375   375   1,321
Total loans 123,369   123,369   110,008
Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 25,729   25,729   29,591
2023/2022 31,043   31,043   37,441
2022/2021 37,420   37,420   48,267
2021/2020 43,538   43,538   20,168
2020/2019 16,382   16,382   29,268
Prior 81,588   81,588   69,682
Revolving Loans Amortized to Basis 5,819   5,819   5,670
Revolving Loans Converted to Term         199
Total loans 241,519   241,519   240,286
Current period gross charge-offs, 2020/2019         804
Current period gross charge-offs, Total         804
Pass | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 70,446   70,446   128,219
2023/2022 135,084   135,084   118,099
2022/2021 103,167   103,167   125,833
2021/2020 109,220   109,220   69,601
2020/2019 66,234   66,234   57,123
Prior 184,469   184,469   164,651
Revolving Loans Amortized to Basis 55,606   55,606   64,716
Revolving Loans Converted to Term 881   881   70
Total loans 725,107   725,107   728,312
Pass | Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 3,944   3,944   17,801
2023/2022 17,674   17,674   6,750
2022/2021 6,105   6,105   15,067
2021/2020 8,752   8,752   8,415
2020/2019 10,836   10,836   10,322
Prior 27,617   27,617   26,538
Revolving Loans Amortized to Basis 383   383   351
Revolving Loans Converted to Term 881   881    
Total loans 76,192   76,192   85,244
Pass | Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 10,278   10,278   22,662
2023/2022 20,124   20,124   34,816
2022/2021 22,597   22,597   12,767
2021/2020 7,951   7,951   5,831
2020/2019 4,878   4,878   4,912
Prior 20,559   20,559   19,587
Revolving Loans Amortized to Basis 48,051   48,051   56,391
Revolving Loans Converted to Term         70
Total loans 134,438   134,438   157,036
Pass | Commercial | Commercial real estate (non-owner occupied) - retail          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 12,928   12,928   35,545
2023/2022 39,137   39,137   23,368
2022/2021 21,155   21,155   33,110
2021/2020 32,227   32,227   23,146
2020/2019 22,520   22,520   9,226
Prior 39,423   39,423   35,102
Revolving Loans Amortized to Basis 978   978   983
Total loans 168,368   168,368   160,480
Pass | Commercial | Commercial real estate (non-owner occupied) - multi-family          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 17,567   17,567   22,620
2023/2022 27,106   27,106   16,767
2022/2021 16,515   16,515   16,622
2021/2020 16,951   16,951   12,041
2020/2019 11,618   11,618   9,638
Prior 30,938   30,938   28,632
Revolving Loans Amortized to Basis 375   375   1,321
Total loans 121,070   121,070   107,641
Pass | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 25,729   25,729   29,591
2023/2022 31,043   31,043   36,398
2022/2021 36,795   36,795   48,267
2021/2020 43,339   43,339   20,168
2020/2019 16,382   16,382   23,025
Prior 65,932   65,932   54,792
Revolving Loans Amortized to Basis 5,819   5,819   5,670
Total loans 225,039   225,039   217,911
Special Mention | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023/2022         314
2022/2021 308   308   591
2021/2020 5,475   5,475    
2020/2019         2,252
Prior 4,034   4,034   4,944
Revolving Loans Amortized to Basis 1,000   1,000   923
Total loans 10,817   10,817   9,024
Special Mention | Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2022/2021         464
2021/2020 3,667   3,667    
2020/2019         2,252
Revolving Loans Amortized to Basis         923
Total loans 3,667   3,667   3,639
Special Mention | Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2022/2021         127
2021/2020 1,808   1,808    
Prior 473   473    
Revolving Loans Amortized to Basis 1,000   1,000    
Total loans 3,281   3,281   127
Special Mention | Commercial | Commercial real estate (non-owner occupied) - retail          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023/2022         314
2022/2021 308   308    
Prior         1,167
Total loans 308   308   1,481
Special Mention | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Prior 3,561   3,561   3,777
Total loans 3,561   3,561   3,777
Substandard | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 47   47    
2023/2022         1,662
2022/2021 1,043   1,043    
2021/2020 199   199   966
2020/2019 928   928   7,521
Prior 15,512   15,512   13,078
Revolving Loans Amortized to Basis 180   180   64
Revolving Loans Converted to Term         199
Total loans 17,909   17,909   23,490
Substandard | Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024/2023 47   47    
Prior 605   605   264
Total loans 652   652   264
Substandard | Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023/2022         619
2022/2021 418   418    
Prior 1,441   1,441   1,578
Revolving Loans Amortized to Basis 180   180   64
Total loans 2,039   2,039   2,261
Substandard | Commercial | Commercial real estate (non-owner occupied) - multi-family          
Financing Receivable, Credit Quality Indicator [Line Items]          
2021/2020         966
2020/2019 928   928   1,278
Prior 1,371   1,371   123
Total loans 2,299   2,299   2,367
Substandard | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023/2022         1,043
2022/2021 625   625    
2021/2020 199   199    
2020/2019         6,243
Prior 12,095   12,095   11,113
Revolving Loans Converted to Term         199
Total loans $ 12,919   $ 12,919   $ 18,598